Lake Levels and Runoff May 18, 2018
With the issues about flooding risks in the central and southern interior, we have been tracking the Provincial runoff and river level forecasts for the Shuswap Lake and the South Thompson River. The Province provides a daily forecast for the river discharge for the South Thompson River at Chase 10days into the future. Using this information the expected change in Shuswap Lake levels over that period can be calculated. Based on Thursday’s projection for the next 10 days, we estimate that the lake level could rise an additional .6 m (2 ft.) by the 26th of May. This lake level will be approaching last year’s peak. Review of the snowpack data also available from the Province indicates that there could still be a substantial snowpack (400 to 600 mm of Snow Water Equivalent) yet to come from the tributary drainages so there could be even further increases in lake levels into early June.
We will be monitoring this information as it is released by the Province and will provide you with an update twice each week or more frequently if there is a substantive change in the projections.